A master-slave fuzzy logic control scheme for maximum power point tracking in wind energy systems

A novel master-slave fuzzy logic control (FLC) scheme for maximum power point tracking (MPPT) is proposed in this paper for wind energy conversion power system. The master fuzzy logic controller tracks the maximum power point (MPP) by generating appropriate generator speed references for the slave fuzzy logic engine (FLE). The slave FLE then forces the system to operate towards the dictated speed reference. The slave communicates to the master FLE whenever a reference has been reached. Each reference is generated only when the previous speed reference has been reached; as a result, actions due to measurement inaccuracies are avoided. In addition, the proposed scheme can distinguish between atmospheric change and intentional system perturbation, without the aid of a wind speed sensor. Detailed explanations of the proposed control logic are discussed and illustrated in this paper. Simulation results have verified the proposed concept and are provided in this paper.